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SIP SRTP Fallback to Nonsecure RTP
The SIP SRTP Fallback to Nonsecure RTP feature enables a Cisco IOS Session Initiation Protocol (SIP) gateway to fall back from Secure Real-time Transport Protocol (SRTP) to Real-time Transport Protocol (RTP) by accepting or sending an RTP/Audio-Video Profile(AVP) (RTP) profile in response to an RTP/SAVP (SRTP) profile. This feature also allows inbound and outbound SRTP calls with nonsecure SIP signaling schemes (such as SIP URL) and provides the administrator the flexibility to configure Transport Layer Security (TLS), IPsec, or any other security mechanism used in the lower layers for secure signaling of crypto attributes.
Finding Feature Information
Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the Feature Information Table at the end of this document.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Prerequisites for SIP SRTP Fallback to Nonsecure RTP
Configuring SIP SRTP Fallback to Nonsecure RTP
To enable this feature, see the "Configuring SIP Support for SRTP" section of the Cisco IOS SIP Configuration Guide, Release 15.1 at the following URL: http://www.cisco.com/en/US/docs/ios/voice/sip/configuration/guide/sip_cg-srtp_ps10592_TSD_Products_Configuration_Guide_Chapter.html
Detailed command information for the srtp, srtp negotiate, and voice-class sip srtp negotiatecommands is located in the Cisco IOS Voice Command Reference http://www.cisco.com/en/US/docs/ios/voice/command/reference/vr_book.html
Feature Information for SIP SRTP Fallback to Nonsecure RTP
The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Feature History Table entry for the Cisco Unified Border Element.
| Table 1 | Feature Information for SIP SRTP Fallback to Nonsecure RTP |
|
Feature Name |
Releases |
Feature Information |
|---|---|---|
|
SIP SRTP Fallback to Nonsecure RTP |
12.4(22)T |
The SIP SRTP Fallback to Nonsecure RTP feature enables a Cisco IOS Session Initiation Protocol (SIP) gateway to fall back from SRTP to RTP by accepting or sending an RTP/AVP(RTP) profile in response to an RTP/SAVP(SRTP) profile. This feature also allows inbound and outbound SRTP calls with nonsecure SIP signaling schemes (such as SIP URL) and provides the administrator the flexibility to configure TLS, IPsec, or any other security mechanism used in the lower layers for secure signaling of crypto attributes. The following commands were introduced or modified: srtp (voice), srtp negotiate, and voice-class sip srtp negotiate |
Feature History Table entry for the Cisco Unified Border Element (Enterprise).
| Table 2 | Feature Information for SIP SRTP Fallback to Nonsecure RTP |
|
Feature Name |
Releases |
Feature Information |
|---|---|---|
|
SIP SRTP Fallback to Nonsecure RTP |
Cisco IOS XE Release 3.1S |
The SIP SRTP Fallback to Nonsecure RTP feature enables a Cisco IOS Session Initiation Protocol (SIP) gateway to fall back from SRTP to RTP by accepting or sending an RTP/AVP(RTP) profile in response to an RTP/SAVP(SRTP) profile. This feature also allows inbound and outbound SRTP calls with nonsecure SIP signaling schemes (such as SIP URL) and provides the administrator the flexibility to configure TLS, IPsec, or any other security mechanism used in the lower layers for secure signaling of crypto attributes. The following commands were introduced or modified: srtp (voice), srtp negotiate, and voice-class sip srtp negotiate |
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